Desktop Notifications - click to navigate?

Long-time Chrome user finally giving it the boot.
I'm using Slack, and I do have desktop notifications working - when a new message comes in, a little thing pops up in the corner of the screen to let me know.

With Chrome, I can click on that popup to open and focus the Slack tab. Clicking the notification for Vivaldi doesn't do anything at all.

Is this a known issue / is there a setting I messed up?

The only oddity I've noticed so far in my setup is that Windows won't let me pick a default browser anymore (it displays the options, but selecting them just closes the selection window and does not actually set them as the default browser)

update: Windows has allowed me to set a default browser, but clicking the notification is still a nothing